BOP Inmate Locator By Number: Complete 2026 Guide To Federal Prisoner Searches

The Federal Bureau of Prisons (BOP) manages custody records for hundreds of thousands of individuals sentenced for federal crimes. For legal professionals, family members, and researchers seeking to locate an individual within this system, the official BOP Inmate Locator stands as the primary tool. While searching by name is possible, utilizing a specific identification number remains the most accurate, reliable, and instantaneous method to track custody status, current facility locations, and projected release dates.

This guide details how the BOP Inmate Locator system functions in 2026, analyzes the various identification number formats accepted by the database, provides a step-by-step walkthrough for performing searches, and outlines actionable next steps once an inmate is located.

Understanding Federal Inmate Identification Numbers

The database maintains records for all federal inmates incarcerated from 1982 to the present. To prevent search errors and eliminate issues arising from common names or aliases, the system prioritizes searches using unique numerical identifiers.

The BOP database processes four distinct categories of identification numbers. Understanding the structure of these numbers ensures you select the correct search parameters and interpret the results accurately.

1. BOP Register Number

The BOP Register Number is the standard and most frequently used identification number for federal prisoners. It consists of an eight-digit sequence formatted as five digits, a hyphen, and three digits (for example: 12345-123).

The final three digits of the Register Number represent a suffix code. This code indicates the specific federal judicial district or processing center where the individual was originally sentenced or processed. Because this number is assigned permanently at the time of federal booking, it remains identical even if the inmate is transferred across different institutions or released and subsequently re-entered into custody.

2. DCDC Number

The DCDC Number refers to identification codes issued by the District of Columbia Department of Corrections. Historically, individuals convicted of felony offenses within Washington, D.C., were placed under the jurisdiction of the federal BOP. If you are searching for an individual convicted in Washington, D.C., prior to or during the transition of their corrections management, their six-digit DCDC Number can be used to query the federal database.

3. FBI Number

The Federal Bureau of Investigation (FBI) assigns a unique identification number to individuals who have fingerprints processed through the Integrated Automated Fingerprint Identification System (IAFIS) or Next Generation Identification (NGI) system. This alphanumeric identifier stays with an individual throughout their criminal history record. Entering a valid FBI number into the locator will retrieve the associated BOP custody file.

4. INS Number

The Immigration and Naturalization Service (INS) Number—now widely known as the Alien Registration Number or A-Number—is assigned to non-citizens processed through the immigration system or detained under federal authority. This number is typically a nine-digit sequence (or an eight-digit sequence prefixed by a zero). It allows users to track individuals held in federal facilities under immigration-related charges or pending deportation proceedings managed in coordination with the BOP.

How to Use the BOP Inmate Locator by Number

The online locator portal is designed for public access and does not require registration, login credentials, or fees. Follow these steps to complete a search using a verified identification number:

1. Access the Official Portal: Navigate to the official Federal Bureau of Prisons website and select the Inmate Locator application.
2. Select the Search Tab: The tool provides two search tabs: "Find By Name" and "Find By Number". Click on Find By Number.
3. Choose the Number Type: Locate the dropdown menu labeled "Type". Select the specific identifier you have on hand: BOP Register Number, DCDC Number, FBI Number, or INS Number.
4. Input the Sequence: Enter the exact sequence of numbers in the designated search field. While the system is designed to handle hyphens for BOP Register Numbers, it is best to input the digits exactly as issued.
5. Execute and Review: Click the "Search" button. The system will retrieve the matching record. If the number is valid, it will return a single, unique result, eliminating the risk of misidentification.

Comparing BOP Search Methods

To highlight why utilizing a dedicated identification number is superior to name-based queries, the table below compares the two search methodologies across key operational metrics.

Technical Troubleshooting and Data Limitations

While the database is updated daily, users may encounter search errors or struggle to find specific individuals. Understanding the technical boundaries of the database prevents confusion and clarifies why certain records may appear incomplete or missing.

Historical Scope of the Database

The database only contains digital records for federal inmates who were physically incarcerated or under federal custody supervision from 1982 to the present. If you are researching historical records or attempting to locate an individual who completed their sentence prior to 1982, the online database will not return a result. These legacy records must be requested directly from the National Archives and Records Administration (NARA).

Reasons an Inmate May Not Appear in Search Results

If a search using a valid number fails to yield results, consider the following potential system anomalies and custody realities:

• In Transit Status: When an inmate is actively being transferred between federal institutions, their location status may temporarily display as "In Transit." During highly secure transfers, system records may experience a processing delay of 24 to 48 hours before reflecting the new receiving facility.
• Pre-Trial Detainees: Some individuals held in short-term federal detention center contracts or local county jails on federal charges may not be immediately integrated into the central BOP database until they are formally sentenced and designated to a permanent federal facility.
• Private Contract Facilities: While the BOP has steadily reduced its reliance on privately operated correctional facilities, some specialized medical, reentry, or low-security environments operate on independent data systems. Although their population should be listed, minor synchronization delays can occur.
• Security and Witness Protection: Individuals enrolled in federal witness protection programs or those placed under specific safety protocols are systematically removed from public-facing databases to ensure their safety and operational security.

Deciphering Search Results and Custody Statuses

Once you enter a number and execute the search, the system displays a structured results card containing critical biographical and operational data.

Example Search Result Output: Name: DOE, JOHN SMITH Register Number: 12345-123 Age: 42 Race: White Sex: Male Released On: 10/12/2026 (or "Located at: FCI Otisville")

Understanding how the system displays location and release information is vital for scheduling visits, sending mail, or verifying legal status.

Analyzing Facility Codes and Location Statuses

The "Location" field tells you exactly where the individual is housed or if they have transitioned out of secure confinement.

• Specific Facility Names: If the results show an abbreviation like "FCI Otisville," "USP Atlanta," or "FPC Pensacola," the individual is physically housed at that specific Federal Correctional Institution (FCI), United States Penitentiary (USP), or Federal Prison Camp (FPC).
• Released On: If the individual has completed their federal sentence, the database will state "Released On" followed by the exact calendar date. This historical record remains publicly accessible.
• Community Corrections / RRM: If the locator lists "RRM" (Residential Reentry Management), the individual has been transitioned to a community-based halfway house or placed under home confinement as they prepare for official release.
• Not in BOP Custody: This status indicates the individual was released from a federal facility but may still be serving a term of supervised release, or they were transferred to state or local authorities to resolve outstanding warrants (detainers).

Practical Actions After Locating an Inmate

Locating an inmate is typically the first step in establishing communication, providing financial support, or preparing legal filings. The following procedures must be followed precisely to interact with individuals in federal custody.

Sending Correspondence and Publications

To write to a federal inmate, you must address the envelope using their full committed name and their eight-digit BOP Register Number. Failure to include the register number will result in the mail being rejected and returned to the sender.

Correct Mailing Address Format: Inmate Full Name BOP Register Number Facility Name P.O. Box or Street Address City, State, Zip Code

All incoming postal mail is subject to physical inspection for contraband. Some facilities require that personal correspondence be sent to a centralized mail scanning facility, where it is digitized and delivered to the inmate via electronic tablets. Always check the specific facility rules before sending mail.

Sending Funds to a Federal Inmate

Inmates cannot receive cash, personal checks, or money orders directly at their physical facility. All financial transactions must be processed through centralized secure clearinghouses.

1. MoneyGram: Funds can be sent electronically using the MoneyGram network. You must provide the express payment code (Receive Code 17327), the inmate’s full name, and their eight-digit BOP Register Number.
2. Western Union: Similar to MoneyGram, transactions require the Western Union Quick Collect form, using the city code "SBOP" and the state code "DC," alongside the inmate’s registry details.
3. United States Postal Service: Money orders can be mailed to the centralized processing center in Des Moines, Iowa. The money order must be made payable directly to the inmate's full legal name and include their register number in the memo line.

Frequently Asked Questions

How often is the database updated?

The database is synchronized and updated daily to reflect changes in custody status, facility transfers, new admissions, and official releases. However, transactional delays of 24 to 48 hours can occur during weekend transfers or system maintenance windows.

Can I locate an inmate who is held in a state prison or county jail using this tool?

No, the tool only tracks individuals held in federal custody, municipal facilities operating under direct federal contracts, or D.C. Department of Corrections felons. To find individuals in state prisons or local county jails, you must use the respective state Department of Corrections (DOC) locator or county sheriff databases.

What does it mean if an inmate's release date is "Unknown"?

An "Unknown" release date typically indicates that the individual is currently awaiting trial, has not yet been sentenced, or is appealing a sentence that has been vacated. It can also apply to individuals serving life sentences without the possibility of parole or those detained under civil commitment statutes.

Is the BOP Register Number the same as an inmate's social security number or court case number?

No, the BOP Register Number is an internal, unique administrative identifier assigned solely by the Federal Bureau of Prisons. It has no structural relationship to an individual's Social Security Number, FBI criminal history key, or the federal court case number assigned during prosecution.

Can I look up an inmate's historical records if they were released in the 1970s?

No, the digital locator tool only covers records for individuals who were in federal custody in 1982 or later. For genealogical or historical inquiries concerning individuals released prior to 1982, you must submit a formal record search request through the National Archives and Records Administration (NARA).